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Big Surprise—Nobody Wants 8K TVs
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
If I were in the market for a new monitor and I could get an 8k monitor for under $1000 I'd consider it, but right now if one of my monitors broke I'd just be getting another 4k to replace it. The price isn't worth it for me to have high DPI.
For TV my only justification for my 4k TV is that it was free.